linux-kernel - [PATCH] ALSA: intel8x0: Fix missing check in snd_intel8x0m

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Message-Id: <20210131100916.7915-1-dinghao.liu@zju.edu.cn>
Date:   Sun, 31 Jan 2021 18:09:14 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: intel8x0: Fix missing check in snd_intel8x0m_create

When device_type == DEVICE_ALI, we should also check the return
value of pci_iomap() to avoid potential null pointer dereference.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 sound/pci/intel8x0m.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 1b7df0c4e57c..19872cecc9d2 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -1129,13 +1129,14 @@ static int snd_intel8x0m_create(struct snd_card *card,
 		chip->bmaddr = pci_iomap(pci, 3, 0);
 	else
 		chip->bmaddr = pci_iomap(pci, 1, 0);
+
+port_inited:
 	if (!chip->bmaddr) {
 		dev_err(card->dev, "Controller space ioremap problem\n");
 		snd_intel8x0m_free(chip);
 		return -EIO;
 	}
 
- port_inited:
 	/* initialize offsets */
 	chip->bdbars_count = 2;
 	tbl = intel_regs;
-- 
2.17.1